[committed] libstdc++: Use reserved form of [[__likely__]] in

[Jonathan Wakely]

Tested x86_64-linux. Pushed to trunk.

-- >8 --

We should not use [[unlikely]] before C++20, so use [[__unlikely__]]
instead.

libstdc++-v3/ChangeLog:

        * include/std/variant (_Variant_storage::_M_reset): Use
        __unlikely__ form of attribute instead of unlikely.
---
 libstdc++-v3/include/std/variant | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/variant b/libstdc++-v3/include/std/variant
index 13ea1dd3849..3a23d9bc66d 100644
--- a/libstdc++-v3/include/std/variant
+++ b/libstdc++-v3/include/std/variant
@@ -492,7 +492,7 @@ namespace __variant
       constexpr void
       _M_reset()
       {
-       if (!_M_valid()) [[unlikely]]
+       if (!_M_valid()) [[__unlikely__]]
          return;
 
        std::__do_visit<void>([](auto&& __this_mem) mutable
-- 
2.45.2